Question
The electron in the hydrogen atom jumps from excited state (n=3) to its ground state (n=1) and the photons thus emitted irradiate a photosensitive material. If the work functions of the material is 5.1 eV, the stopping potential is estimated to be (the energy of the electron is nth state En = -13.6/n2 eV)
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5.1 V
-
12.1 V
-
17.2 V
-
7 V
Solution
D.
7 V
